Commissioning; Figure 8-15: Settings, 3Rw3 - Siemens sirius System Manual

3RW3 semiconductor motor control unit

8.3.5 Commissioning

Settings
8-30
Every SIRIUS 3RW soft starter comes with the following warning, which it is
imperative to heed:
Caution
This device has been tested carefully at the factory and found to be in wor-
king order.
During transportation, however, it may have been subject to stresses over
which we have no control. The bypass relays in the main circuit may be in an
undefined state.
In the interests of complete safety, the following procedure should be used
at commissioning or after the replacement of the SIRIUS soft starter:
First, apply the supply voltage to A1/A2 in order to put the impulse series
relays in a defined switching state.
Then, switch on the main circuit (L1/L2/L3).
If you do not do this, the motor can be switched on inadvertently and cause
damage to people or parts of the system.

Figure 8-15: Settings, 3RW3

Note
At commissioning, the settings of the potentiometers for the ramp time and
the starting voltage should remain unchanged. These set values must be
obtained in a trial.
3RW31
3RW30
t t
R on
R1
u u
S
S
t t
R off R2
SIRIUS System Manual
GWA 4NEB 430 0999-02b